[Bug 681106] New: removing sync handler from gst bus causes segfault

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=681106
  GStreamer | gst-python | 0.10.22

           Summary: removing sync handler from gst bus causes segfault
    Classification: Platform
           Product: GStreamer
           Version: 0.10.22
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-python
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: nickj4096 at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


I have found two similar situations where removing the sync handler from a
pipeline's bus with set_sync_handler(None) results in a segfault.

Details / Reproducing:

I have two short test cases with backtraces.  In the first, I remove the sync
handler after I have set the pipeline's state to null.
test case: http://pastebin.com/R7dtsj9J
backtrace: http://pastebin.com/rGZbAMXR
The segfault happens regularly on exactly the i==4123 iteration of the loop.

In the second, I remove the sync handler before setting the pipeline to NULL.
test case: http://pastebin.com/ByVQjqH5
backtrace: http://pastebin.com/XzfJeC92
This one segfaults with some probability (the loop is in the test only to
increase probability of occurrence).  Also, in this case, I get a python error
"TypeError: 'tuple' object is not callable" immediately before the segfault.

In both test cases, 'foo.wav' is some input file; different file sizes (incl.
128 samples and 60 minutes) didn't seem to affect occurrence.

System / Install:
Ubuntu 12.04
Python 2.73
python-gst 0.10.22-3
libgstreamer 0.10.36
libglib2 2.23.3
gstreamer0.10-plugins-base 0.10.36
(All gstreamer packages installed in last few months using apt-get.)

I also reproduced these segfaults on Debian Wheezy, with the same python,
gstreamer, and glib versions as above.  On Wheezy, the first testcase
(http://pastebin.com/R7dtsj9J) segfaulted on the i==4122 iteration rather than
i==4123.

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